Ошибка с токеном с библиотекой aiogram

Ошибка в:

aiogram.utils.exceptions.ValidationError: Token is invalid! It must be 'str' type instead of <class 'NoneType'> type.

 from aiogram import Bot, types
 from aiogram.dispatcher import dispatcher 
 from aiogram.utils import executor

 import os


 bot = Bot(token = os.getenv('TOKEN'))
 dp = Dispatcher(bot)

 @dp.message_handler()

 async def echo_send(message : types.Message):

        await message.answer(message.text)
        # await message.reply(message.text)
        # await bot.send_message(message.from_user.id, 
message.text)



executor.start_polling(dp, skip_updates = True)